Pros
Depending on who you report to and the vertical you focus on, you might have great clients and fun challenges to work on. Most of the people here are fantastic, especially folks from legacy Nielsen, who are typically always willing to be a friend and help.
Cons
Depending on the same thing, you may end up in an extremely toxic work environment. If someone makes their number, regardless of the way they treat others, they will be celebrated. Expect favorites, gossip, and scapegoating.